responsive

这个应用程序对各种用户操作都能快速响应。

This app is highly ___responsive to various user actions.

老师对学生的提问总是反应迅速且乐于解答。

The teacher is always ___responsive to students' questions.

孩子对妈妈的拥抱总是特别敏感和热情。

The child is always very ___responsive to his mother's hugs.